NCERT Class XI Chemistry Classification of Elements and Periodicity in Properties Solutions
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Question : 19
Total: 40
The first ionization enthalpy values (in k J m o l – 1
B : 801
Al : 577
Ga : 579
In : 558
Ti : 589
How would you explain this deviation from the general trend?
B : 801
Al : 577
Ga : 579
In : 558
Ti : 589
How would you explain this deviation from the general trend?
Solution:
(i) Al has lower ionization enthalpy than B due to larger size.
(ii) Ga has slightly higher ionization enthalpy than Al due to ineffective shielding by 3d electrons.
(iii) In has lower ionization enthalpy than Ga due to larger size.
(iv) Tl has higher ionization enthalpy than In due to ineffective shielding by 4f electrons.
(ii) Ga has slightly higher ionization enthalpy than Al due to ineffective shielding by 3d electrons.
(iii) In has lower ionization enthalpy than Ga due to larger size.
(iv) Tl has higher ionization enthalpy than In due to ineffective shielding by 4f electrons.
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